Identify likely expert for a file at the selected time

[epage]

In the Show Pane, or maybe a new view within that Pane, we should show who most contributed to that file at that time so you can find not just the author of the change but who they might have consulted

See also

• git-related
• Git guilt, blame, and code review
• git-guilt (original)
• git-guilt (python port)

Blocked on #15